/Engine/Source/Editor/MovieSceneTools/Public/KeyframeTrackEditor.h
Returns whether a key was created
virtual bool Apply ( [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * Section, [FMovieSceneChannelProxy](API\Runtime\MovieScene\Channels\FMovieSceneChannelProxy) & Proxy, [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) InTime, EMovieSceneKeyInterpolation InterpolationMode, bool bKeyEvenIfUnchanged, bool bKeyEvenIfEmpty ) const